/**********************************************************************
 Copyright (C) 2009 Jaakko Vuori

 This file is part of Cimer.
 For more information, see <http://code.google.com/p/cimer/>

 Cimer is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 Cimer is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with Cimer.  If not, see <http://www.gnu.org/licenses/>.
 **********************************************************************/

#include "screensaverpreventer_linux.h"
#include "screensaverpreventer.h"

#include <QTimer>

#include <X11/Xlib.h>
#include <X11/keysym.h>
#include <X11/extensions/XTest.h>
#include <X11/extensions/scrnsaver.h>

const unsigned int SimulationInterval = 30000;

ScreensaverPreventerPrivate::ScreensaverPreventerPrivate(QObject* parent) :
    QObject(parent)
{
    m_display = XOpenDisplay(0);

    QTimer* timer = new QTimer(this);
    timer->start(SimulationInterval);
    connect(timer, SIGNAL(timeout()), this, SLOT(simulateActivity()));
}

ScreensaverPreventerPrivate::~ScreensaverPreventerPrivate()
{
    XCloseDisplay(m_display);
}

void ScreensaverPreventerPrivate::simulateActivity()
{
    XScreenSaverInfo info;
    XScreenSaverQueryInfo(m_display, DefaultRootWindow(m_display), &info);

    if (info.idle > SimulationInterval)
    {
        unsigned int keycode = XKeysymToKeycode(m_display, XK_Shift_L);
        XTestFakeKeyEvent(m_display, keycode, True, 0);
        XTestFakeKeyEvent(m_display, keycode, False, 0);
        XFlush(m_display);
    }
}
